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2 CPU MODULE INSTRUCTIONS
2.7 Process Control Instructions
2.7 Process Control Instructions
When a process control program is created, using process control function blocks is recommended.
Process control function blocks have features as follows.
• A process control program can be easily created by placing and connecting FB elements.
• Since the initial value of the function block can be set in the "FB Property" window of the engineering tool,
the program for the initial value setting is not required.
• An operation constant can be input to a label indicating a tag name without being conscious of address of a
device.
• The operating status of a tag FB can be checked and controlled by accessing the tag data from the
faceplate of an engineering tool.
For details on the process control function blocks, refer to the following.
MELSEC iQ-R Programming Manual (Process Control Function Blocks)
I/O control instructions
■Analog input processing
■Output processing 1 with mode switching
■Output processing 2 with mode switching
■Manual output
■Time proportioning
■Batch counter
■Pulse integration
Instruction symbol Processing details Reference
S.IN Performs following processing to the input data (PV): range check, input limiter, engineering value
transformation, and digital filter.
Page 1197 S.IN
Instruction symbol Processing details Reference
S.OUT1 Calculates MV (0 to 100%) from the input data (MV), and performs the variation rate & upper/
lower limiter processing and output conversion processing.
Page 1203 S.OUT1
Instruction symbol Processing details Reference
S.OUT2 Performs variation rate & upper/lower limiter processing and output conversion processing to the
input data (MV).
Page 1209 S.OUT2
Instruction symbol Processing details Reference
S.MOUT Reads the manipulated value (MV) from the loop tag memory and performs output conversion. Page 1214 S.MOUT
Instruction symbol Processing details Reference
S.DUTY Outputs ON and OFF by changing the ON/OFF ratio in a given cycle in proportion to the input data
(0 to 100%).
Page 1217 S.DUTY
Instruction symbol Processing details Reference
S.BC Compares the input data with the set value, and outputs bit data when it reaches the set value. Page 1223 S.BC
Instruction symbol Processing details Reference
S.PSUM Integrates the number of input pulses, and outputs the operation result. Page 1227 S.PSUM
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